Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC

. 2014 Aug 29 ; 113 (9) : 092301. [epub] 20140826

Status PubMed-not-MEDLINE Jazyk angličtina Země Spojené státy americké Médium print-electronic

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid25215979

We report the first measurements of the moments--mean (M), variance (σ(2)), skewness (S), and kurtosis (κ)--of the net-charge multiplicity distributions at midrapidity in Au+Au collisions at seven energies, ranging from sqrt[sNN]=7.7 to 200 GeV, as a part of the Beam Energy Scan program at RHIC. The moments are related to the thermodynamic susceptibilities of net charge, and are sensitive to the location of the QCD critical point. We compare the products of the moments, σ(2)/M, Sσ, and κσ(2), with the expectations from Poisson and negative binomial distributions (NBDs). The Sσ values deviate from the Poisson baseline and are close to the NBD baseline, while the κσ(2) values tend to lie between the two. Within the present uncertainties, our data do not show nonmonotonic behavior as a function of collision energy. These measurements provide a valuable tool to extract the freeze-out parameters in heavy-ion collisions by comparing with theoretical models.

AGH University of Science and Technology Cracow Poland

Alikhanov Institute for Theoretical and Experimental Physics Moscow Russia

Argonne National Laboratory Argonne Illinois 60439 USA

Brookhaven National Laboratory Upton New York 11973 USA

Central China Normal University Wuhan 430079 China

Cracow University of Technology Cracow Poland

Creighton University Omaha Nebraska 68178 USA

Czech Technical University Prague FNSPE Prague 115 19 Czech Republic

Frankfurt Institute for Advanced Studies FIAS Germany

Indian Institute of Technology Mumbai India

Indiana University Bloomington Indiana 47408 USA

Institute of High Energy Physics Protvino Russia

Institute of Modern Physics Lanzhou China

Institute of Nuclear Physics PAN Cracow Poland

Institute of Physics Bhubaneswar 751005 India

Joint Institute for Nuclear Research Dubna 141 980 Russia

Kent State University Kent Ohio 44242 USA

Korea Institute of Science and Technology Information Daejeon Korea

Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Massachusetts Institute of Technology Cambridge Massachusetts 02139 4307 USA

Max Planck Institut für Physik Munich Germany

Michigan State University East Lansing Michigan 48824 USA

Moscow Engineering Physics Institute Moscow Russia

National Institute of Science Education and Research Bhubaneswar 751005 India

Nuclear Physics Institute AS CR 250 68 Řež Prague Czech Republic

Ohio State University Columbus Ohio 43210 USA

Old Dominion University Norfolk Virginia 23529 USA

Panjab University Chandigarh 160014 India

Pennsylvania State University University Park Pennsylvania 16802 USA

Purdue University West Lafayette Indiana 47907 USA

Pusan National University Pusan Republic of Korea

Rice University Houston Texas 77251 USA

Shandong University Jinan Shandong 250100 China

Shanghai Institute of Applied Physics Shanghai 201800 China

SUBATECH Nantes France

Temple University Philadelphia Pennsylvania 19122 USA

Texas A and M University College Station Texas 77843 USA

Tsinghua University Beijing 100084 China

United States Naval Academy Annapolis Maryland 21402 USA

Universidade de Sao Paulo Sao Paulo Brazil

Universidade Estadual de Campinas Sao Paulo Brazil

University of Birmingham Birmingham United Kingdom

University of California Berkeley California 94720 USA

University of California Davis California 95616 USA

University of California Los Angeles California 90095 USA

University of Houston Houston Texas 77204 USA

University of Illinois at Chicago Chicago Illinois 60607 USA

University of Jammu Jammu 180001 India

University of Kentucky Lexington Kentucky 40506 0055 USA

University of Rajasthan Jaipur 302004 India

University of Science and Technology of China Hefei 230026 China

University of Texas Austin Texas 78712 USA

University of Washington Seattle Washington 98195 USA

University of Zagreb Zagreb HR 10002 Croatia

Valparaiso University Valparaiso Indiana 46383 USA

Variable Energy Cyclotron Centre Kolkata 700064 India

Warsaw University of Technology Warsaw Poland

Yale University New Haven Connecticut 06520 USA

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